First observations of energetic particles near comet Halley

Details First observations of energetic particles near comet Halley First observations of energetic particles near comet Halley

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.321..285s&link_type=abstract

Nature (ISSN 0028-0836), vol. 321, May 15, 1986, p. 285-288.

Physics

54

Cometary Atmospheres, Energetic Particles, Halley'S Comet, Photoionization, Solar Wind, Vega Project, Bow Waves, Ion Density (Concentration), Shock Waves, Spacecraft Trajectories, Comets, Halley, Spacecraft Observations, Mission Description, Experiments, Tunde-M, Energetic Particle Analyser, Vega 1, Flux, Ions, Distance, Solar Wind, Bow Shock, Intensity, Comet Nuclei, Interactions

Scientific paper

The TÜNDE-M energetic particle instrument aboard the Vega 1 spacecraft detected intense fluxes of energetic (≥40 keV) ions in the vicinity of comet Halley, starting at a distance of 107km from closest approach. Three regions of differing ion characteristics have been identified. An outer region, several million kilometres in extent, contains pick-up ions in the solar wind. A second region, inside the bow shock (several hundred thousand kilometres in extent), contains the most intense fluxes, whereas the innermost region (several tens of thousands of kilometres) is characterized by lower intensities and sharp spikes near closest approach (≡8,900 km from the nucleus).

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